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Math Help - Topology Proofs, Bases

  1. #1
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    Topology Proofs, Bases

    1) B={(a,b)|a,b are rational numbers} is a countable base for the usual topology for the real numbers.

    2) For any topologies T1 and T2 for X, if B1 is a base for T1 and B1 is a subset of T1, then T1 is a subset of T2
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  2. #2
    Super Member girdav's Avatar
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    Re: Topology Proofs, Bases

    Where are you stuck? Is it clear that B is countable in the first question?
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